What do heart wood and sap wood stand...

What do heart wood and sap wood stand for ?

Verified by Experts

Heart wood refers to the dark central part of wood .
Sap wood refers to the pale peripheral part of wood .

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Heart wood differs from sapwood in

the presence of rays and fibres

the absence of vessels and parenchyma

having dead and non-conduting elements

being susceptible to hosts and pathogens

(A) and (R ) are wrong

(A) and (R ) are correct but (R ) is not the explanation for (A) .

(A) is right, (R ) is wrong

(R ) explains (A) .

more fragile and resistant to the attack of insects

more durable and more resistant to the attack of micro organism and insects

more hard and less resistant to the attack of micro organism

less durable and more resistant to the attack of micro organism and insects